// JavaScript Document
	
		var currentItem = 1;
		var totalNumItems = 12;
		
		function forward()
		{
			toggleItemVisibility( currentItem );
			if ( currentItem == totalNumItems ) {
				currentItem = 1;
			}
			else {
				currentItem += 1;
			}			
			toggleItemVisibility( currentItem );
		}
		
		function back()
		{
			toggleItemVisibility( currentItem );
			if ( currentItem == 1 ) {
				currentItem = totalNumItems;
			}
			else {
				currentItem -= 1;
			}			
			toggleItemVisibility( currentItem );
		}
		
		function toggleItemVisibility( n )
		{ 
			var itemName = "ri_" + n;
			
			var styleObj = document.getElementById( itemName ).style;
			if ( styleObj.visibility == 'hidden' ) {
				//alert("Toggling: " + itemName + " setting to visible");
				styleObj.visibility = 'visible';
			}
			else {
				//alert("Toggling: " + itemName + " setting to hidden");
				styleObj.visibility = 'hidden';
			}
		}